There is a very special charity auction underway, featuring the personal chair used by author J.K. Rowling when she wrote the first two Harry Potter novels in her flat in Scotland. The chair, first donated and sold at auction in 2002 for charity, has now been donated again by the former owner, this time in effort to help the Books Abroad charity which sends free school books to impoverished countries. As seen here on Ebay, the auction is open now until July 26, and includes some wonderful photos. The elaborately decorated chair comes with special authentication written by J.K. Rowling, written on a special Owl Post. Ananova reports:

Rowling wrote The Philosopher’s Stone and Chamber of Secrets on the
chair in her Scottish council flat when she was a single mother,
surviving on benefits and struggling with depression.It has
been personalised by the author herself and features several painted
slogans including: “I wrote Harry Potter while sitting on this chair.”

.. The letter explains that she was given four mismatched dining room
chairs in 1995 and, because it was the most comfortable, it was this
one that ended up at her desk in front of her typewriter.The author finishes off the letter with the comment: “My nostalgic side is sad to see you go but my back isn’t.”